Remove caml_get_header_val, as not needed. #4189
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This arose during review of #3493 :
caml_get_header_val
only differs fromHd_val
in that it will spin if it sees an in-progress header, i.e. if some domain is in the process of promoting the block. This can only happen between the barriers of a minor collection; there are very few places outsideminor_gc.c
where it might be possible, and certainly not while updating finalizer data structures after a minor GC.